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Can Insects, Bacteria, and Plants Have Personalities Too?

If personality amounts to observed individual differences in behavior, the answer is yes, though the issues are more complex for plants

Yesterday, we looked at a paper in which researchers reported that marmosets (a South American monkey) have personalities. Most of us would simply assume that they do and we are right to think so. Research on many vertebrate animal species shows that even reptiles and fish have personalities. Of course, the number of dimensions a vertebrate’s personality can have varies with its intellectual and lifestyle complexity. But now, what about the vast world of the invertebrates, the life forms whose body is not organized around a spinal cord terminating in a brain? Their body plans can vary from that of a starfish through to a honeybee. Can they have personalities, despite very different brain arrangements, including — in some cases…